The Oros tech pack includes three strike indicator colors glow-in-the-dark, black/anti-glare and hi-visibility chartreuse. Combine colors or add two indicators for situations where lighting, glare, or deep shadows cause varied lighting conditions. Black/Anti-Glare:Great for highly-reflective lighting situations. Use when the sun is low on the horizon, or during overcast days when glare off the water is high. Glow-in-the-dark:Great for early morning, evening, or night. Extend your time on the water with the extra visibility the glow in the dark indicators give Chartreuse:Great all-around color for high visibility, and an alternative to white when there are riffles and foamy conditions. Size: Small - 0.8 inches diameter Pack size:3-pack